WO1999051052A1 - Selection de cellules dans des systemes radio mobiles - Google Patents

Selection de cellules dans des systemes radio mobiles Download PDF

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Publication number
WO1999051052A1
WO1999051052A1 PCT/SE1999/000440 SE9900440W WO9951052A1 WO 1999051052 A1 WO1999051052 A1 WO 1999051052A1 SE 9900440 W SE9900440 W SE 9900440W WO 9951052 A1 WO9951052 A1 WO 9951052A1
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WO
WIPO (PCT)
Prior art keywords
mobile station
base stations
further characterized
cell
air interface
Prior art date
Application number
PCT/SE1999/000440
Other languages
English (en)
Inventor
Håkan Gunnar OLOFSSON
Peter Schramm
Frank Müller
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to CA002326637A priority Critical patent/CA2326637A1/fr
Priority to BR9909304-9A priority patent/BR9909304A/pt
Priority to DE19983085T priority patent/DE19983085B3/de
Priority to AU36330/99A priority patent/AU3633099A/en
Priority to GB0024558A priority patent/GB2352139B/en
Publication of WO1999051052A1 publication Critical patent/WO1999051052A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates generally to the problem of cell selection, for e.g. cell handover, in mobile telecommunication systems, and more particularly to the problem of selecting the optimum cell among cells with differing capabilities due to different air interface modes.
  • FIG 1 is shown a view of a typical mobile system with many cells and a number of mobile stations ("MS”) .
  • MS mobile stations
  • Each of these cells has an associated base station ("BS") which is responsible for radio communication over the air interface to mobile stations in that cell.
  • BS base station
  • the handover process uses measurements made by the mobile station, the serving base station, and/or by surrounding base stations, using these measurements in the handover decision-making process. These measurements can be taken of the quality of the connections, or links, between the MS and the base station or surrounding base stations.
  • Link quality measurements include e.g. the raw bit error rate ("BER") and the received signal 2 strength of the various links between the MS and its serving base station or between the MS and the surrounding base stations.
  • a mobile station monitors the link quality (e.g. raw BER estimate and received signal strength) of the signal (downlink signal) received from the base station of the serving cell, as well as the link quality in terms of reception level, i.e. the received signal strength, of the downlink signal from the base stations in cells adjacent to the serving cell.
  • the base station of the cell monitors the quality of the signal (uplink signal) received to the base station from every mobile station that is served by that base station.
  • Handover then occurs when either the measurement of the MS/BS indicates that the link quality in the currently serving cell is low and a better quality can be obtained from an adjacent cell, or an adjacent cell allows communication with lower transmission levels.
  • the problem of handover in today' s systems can be summed up by saying that the strategy is to keep the mobile station connected to the "best" cell.
  • the problem of selecting the "best" cell is simple in today' s systems compared with the new systems to be developed over the coming years. These future systems will be based on different radio interface modes (e.g. with different coding and modulation schemes) .
  • Modulation is essentially the function which imposes the characteristics of the electromagnetic field (e.g. amplitude and frequency) onto a set of rules and the data to be transmitted (which "modulates" 3 the transmission) .
  • the phase of the electromagnetic field which carries the information. It is usual to distinguish the modulation and demodulation on one hand, and the transmission and reception on the other.
  • the first processes transform digital data to and from a low frequency modulated signal
  • the second pair of processes transform this low frequency modulated signal to and from the electromagnetic field.
  • GMSK Gaussian Minimum Shift Keying
  • DQPSK Differential Quaternary Phase-Shift Keying
  • DCPM Differentially-encoded Binary Continuous Phase Modulation
  • Q-O-QAM Quaternary-Offset-Quadrature Amplitude Modulation
  • a key difference between these different modulation schemes is that they provide users with different data rates.
  • the goal of the evolution of these systems is to increase user bit rate.
  • the result is that the systems will be using different modulation schemes, often in neighboring cells, in order to provide different users more options for which data rate they will use.
  • differing data rates will often require differing channel coding schemes.
  • several coding schemes 4 may be used for one modulation. As a result, there will be a variety of coding and modulation schemes providing different data rates.
  • the present invention relates generally to the problem of cell selection, for e.g. cell handover, in mobile telecommunication systems, and more particularly to the problems discussed above.
  • the means of solving these problems according to the present invention are summarized in the following.
  • QoS Quality of Service
  • the maximum QoS can be given in terms of e.g. higher data/bit rate or throughput.
  • This new method of selecting the best cell is done by extending the known algorithm for cell selection and handover, and then applying additional criteria that take into account the capabilities of mobile station and the base stations that are possible candidates.
  • achievable data rate for "transparent” services
  • throughput for “non-transparent” services
  • data rate or throughput on some connections may be increased at the cost of higher interference.
  • another embodiment of the present invention is to take into account system measures like e.g. load and estimated interference level. This may be useful in order to enable the operator to allow such far-distance connections with high data rates only if impact on the system is low. This would be true where e.g. the system load is low.
  • FIG. 1 is a drawing of a cellular mobile communications system.
  • FIG. 2a is a diagram of a mobile station and handover candidates in the system shown in Figure 1. 7
  • FIG. 2b is a graph showing the relationship between the data rate and signal power for a given interference level.
  • FIGS. 3a and 3b show a flowchart illustrating the steps of the method of the present invention.
  • FIGS. 4a and 4b show a flowchart illustrating the steps of the method of the present invention for non-transparent services.
  • FIGS. 5a and 5b show a flowchart illustrating the steps of the method of the present invention for transparent services.
  • FIG 2a can be seen a closer view of a few cells e.g. 210, 220, in a mobile system 200 with numerous cells and associated base stations. Also shown is one mobile station ("MS") although, of course, the present invention is not limited to systems with the number of cells shown here or for use with only one MS. The MS here is preparing for a handover to several possible candidates for handover. Although the method illustrated here is specifically shown for a handover procedure, the method of the present invention is one for general "cell selection", equally applicable to e.g. the problem of initial cell selection during call set-up or cell selection performed by the mobile stations during e.g. idle mode.
  • first cell 210 For illustration purposes there are shown here two suitable candidates, either the first cell 210 or the second cell 220.
  • responsibility for communications on the air interface 215 in the first cell 210 is taken by the first base station BS1.
  • responsibility for communications on the air interface 225 in the second cell 220 is taken by the second base station BS2.
  • the MS supports several air interface modes (e.g. schemes SI, S2 and S3) that are based on different 8 coding and modulation schemes. These schemes provide different data rates. However, the signal power required to provide a given link quality and given interference level for each of these schemes is different.
  • schemes SI, S2 and S3 e.g. schemes SI, S2 and S3 that are based on different 8 coding and modulation schemes. These schemes provide different data rates. However, the signal power required to provide a given link quality and given interference level for each of these schemes is different.
  • the first base station BSl also supports these three air interface schemes SI, S2 and S3.
  • the second base station BS2 supports only one scheme SI, providing the lowest data rate. It should be emphasized, however, that the invention is not restricted to base stations having this particular number of schemes. For example, in proposed standards for GSM it is planned that base stations will be capable of supporting up to eight different schemes.
  • the general method described below will function in all cases, e.g. if (1) the MS supports Sl-3 and BSl supports Sl-3 (as shown in Figure 2a) , or (2) the MS supports Sl-2, and BSl supports Sl-3, or (3) the MS supports Sl-3, and BSl supports Sl-2, or (4) the current standard handover situation where both MS and BSl support SI everywhere.
  • the current method functions the same, independent of how many schemes the MS or the BSs support. In general, all possible links are checked for maximum QoS or throughput, and the link providing it will be selected.
  • Figure 2b is shown a typical relation between the signal power which is required e.g. to obtain a desired bit error rate for a given interference (and noise) level, and provided data rate on the air interface (including forward error correction) .
  • the required signal power typically increases as the data rate increases.
  • the air interface modes SI, S2 and S3 provide different data rates, but on the other hand are differently susceptible to interference (and noise) .
  • Estimates of which handover choice 9 is best should take into consideration this sensitivity when deciding which scheme will provide the best data rate.
  • the links MS- BS1 215 and MS-BS2 225 are checked not only for a maximum link quality, but the capabilities of both the base stations, BSl and BS2, as well as the MS are considered as well.
  • link quality may be given by one or several measures like e.g. the received signal level on the broadcast channel, the carrier-to-interference power ratio ("C/I") , the raw BER estimate.
  • C/I carrier-to-interference power ratio
  • the cell 210 with BSl is selected by the present invention' s selection algorithm which is usually performed by a control unit on the network side, e.g. the base station controller ("BSC”) in a GSM system.
  • BSC base station controller
  • the application of the present algorithm differs according to whether the type of service being provided is a "transparent” service or a “non-transparent” one. A brief explanation of these is in order. It is known that for a given noise and interference level and given channel conditions, the characteristics of transmission when error correction is provided is a compromise between the throughput of data, the transmission delay and the remaining error rate. In modern 10 systems like GSM, no single trade-off fits all the different types of services (e.g. speech vs. data). Out of the possibilities, a short delay despite a relatively high error rate is better in some cases, whereas (e.g. fax) a long delay can be tolerated in order to achieve a better transmission quality.
  • a short delay despite a relatively high error rate is better in some cases, whereas (e.g. fax) a long delay can be tolerated in order to achieve a better transmission quality.
  • connection For those reasons, several 'types of connection are provided in GSM. For those services to which the transmission is “transparent” (e.g. speech) the system provides a connection with a constant bit rate. For the "non-transparent” services (e.g. fax) there is no continuous connection. The information is sent in packets which may be retransmitted if errors occur, leading to a lower “effective bit rate", which is termed "throughput”.
  • the present invention uses a prediction of data rate and throughput in the handover decision making process. To do this, different levels of robustness of the air interface modes against noise and interference are taken into account. For non-transparent services this is done by estimating the throughput. For transparent services the quality of service (“QoS”), given by e.g. the bit rate and required bit error rate, is the most suitable criterion. QoS can also be defined for non-transparent services, and then is equal to throughput. This general definition of QoS is used particularly in the following general description of the present invention.
  • QoS quality of service
  • the first step 310 in the algorithm is to determine, by monitoring, the capabilities of the BS candidates. These capabilities include e.g. supported coding schemes, supported modulation schemes, multicarrier capability, and multislot capability. This determination is done continuously and will typically be performed in e.g. the base station controller BSC. In addition, the capabilities of the MS must also be checked in the first step 310. This is because the MS may not necessarily support all the schemes available for each BS candidate. Only the capabilities of links on a BS which are supported by the MS need to be considered.
  • the second step 320 of the algorithm is to measure the link qualities of the BS candidates.
  • the link quality may be given by one or more of a variety of possible measures, including, but not limited to, (1) received signal strength on the broadcast channel BCH, (2) carrier-to-interference ("C/I") estimate for the BCH or traffic channel, and (3) raw BER estimate on a traffic channel.
  • C/I carrier-to-interference
  • the third step 330 of the algorithm is to estimate a quality of service ("QoS") value for each possible connection with each candidate base station.
  • QoS quality of service
  • This estimation procedure can be performed according to appropriate algorithms which are not the subject of the present invention.
  • the objective is to use the available information for each cell, e.g. received signal strength combined with cell capabilities, to estimate the best QoS for each cell.
  • the final step 340 of the algorithm is to select the BS among the list of handover candidates to which connection provides the best QoS. Handover will then be performed to that cell providing the best QoS.
  • Figure 3b illustrates an optional extension to this final step.
  • the first three steps 310, 320 and 330 in Figure 3a have corresponding equivalent steps 315, 325, and 335, in the embodiment shown in Figure 3b.
  • the final estimation procedure 345 of selecting the BS with the best QoS 12 may additionally take into account system criteria like load and interference level, as further described below.
  • system criteria like load and interference level, as further described below.
  • no system criterion is explicitly used. Instead, these values may be taken into account inherently by estimation of the best QoS on the various links.
  • system parameters such as load may also be used explicitly as in Figure 3b.
  • FIG. 3b These further criteria used in Figure 3b are those which are suitable from a system point of view, e.g. to avoid a significant increase of average outage probability or interference level.
  • One such system criterion may be the load on the candidate base stations. This information is available in the control unit, e.g. the BSC, that performs the cell selection algorithm.
  • a simple implementation is to allow the connection, e.g. MS-BSl, only if the load on BSl is below a pre-defined threshold. This may be defined by the percentage of used traffic channels. By this additional criterion, an impact on the total interference can be avoided.
  • the network operator may be able to adapt the parameters of this extended cell algorithm individually. For instance, it may be possible to have MSs that have higher priority for high data rate connections than other MSs. This may be implemented by using different thresholds for the allowed load for the selection of cells providing higher data rates.
  • the system criterion "load” may not be sufficient where e.g. the increase of interference is more crucial, and load is only a rough estimate of this value.
  • the suitable system criterion for cell selection is the estimate of increase of interference by selecting the link MS-BSl with higher data rates.
  • criteria may be combined to take into account several aspects.
  • the base station with maximum value Q>0 would be selected.
  • the first step 410 in the algorithm is to determine, by monitoring, the capabilities of the BS candidates. These capabilities include e.g. supported coding schemes, supported modulation schemes, multicarrier capability, and multislot capability. This determination is done continuously and will typically be performed in e.g. the base station controller BSC. In addition, the capabilities of the MS must also be checked. This is because the MS may not necessarily support all the schemes available for each BS candidate. Only the capabilities of links on a BS which are supported by the MS need to be considered.
  • the second step 420 of the algorithm is to measure the link qualities of the BS candidates.
  • the link quality may be given by one or more of a variety of possible measures, including, but not limited to, (1) received signal strength on the broadcast channel BCH, (2) carrier-to-interference ("C/I") estimate for the BCH or traffic channel, and (3) raw BER estimate on a traffic channel.
  • C/I carrier-to-interference
  • the third step 430 of the algorithm is to estimate the throughput for all the BSs. This can be compared to the method in Figures 3a and 3b.
  • the best QoS in the general method of Figures 3a, 3b becomes the highest data throughput when providing non-transparent services as in Figures 4a, 4b.
  • This 14 estimation procedure of throughput can be performed according to appropriate algorithms which are not part of the present invention.
  • the objective is to use the available information for each cell, e.g. received signal strength combined with cell capabilities, to estimate the maximum throughput for each cell.
  • the final step 440 of the algorithm is to select the BS among the list of handover candidates to which connection provides maximum throughput. Handover will then be performed to that cell providing the maximum throughput.
  • Figure 4b illustrates an optional extension to this final step.
  • the first three steps 410, 420 and 430 in Figure 4a have corresponding equivalent steps 415, 425, and 435, in the embodiment shown in Figure 4b.
  • the final selection procedure 445 of selecting the BS with the best QoS may additionally take into account system criteria like load and interference level, as further described above in connection with Figure 3b.
  • system criteria like load and interference level, as further described above in connection with Figure 3b.
  • system parameters such as load may also be used explicitly as in Figure 4b.
  • the first step 510 in the algorithm is to determine, by monitoring, the capabilities of the BS candidates. These capabilities include e.g. supported coding schemes, supported modulation schemes, multicarrier capability, and multislot capability. This determination is done continuously and will typically be performed in e.g. the base station controller BSC. In addition, the capabilities of 15 the MS must also be checked. This is because the MS may not necessarily support all the schemes available for each BS candidate. Only the capabilities of links on a BS which are supported by the MS need to be considered.
  • capabilities of the BS candidates include e.g. supported coding schemes, supported modulation schemes, multicarrier capability, and multislot capability. This determination is done continuously and will typically be performed in e.g. the base station controller BSC.
  • the capabilities of 15 the MS must also be checked. This is because the MS may not necessarily support all the schemes available for each BS candidate. Only the capabilities of links on a BS which are supported by the MS need to be considered.
  • the second step 520 of the algorithm is to measure the link qualities of the BS candidates, as discussed previously.
  • the link quality may be given by one or more of a variety of possible measures, including, but not limited to, (1) received signal strength on the broadcast channel BCH, (2) carrier-to- interference (“C/I") estimate for the BCH or traffic channel, and (3) raw BER estimate on a traffic channel.
  • C/I carrier-to- interference
  • the carrier-to- interference ratio, C/I provides a better estimate of link quality.
  • the third step 530 of the algorithm in Figure 5a shows a difference in the application of the invention to transparent services as contrasted with the general method of Figures 3a, 3b, and with non-transparent services in Figures 4a, 4b.
  • the third step of the algorithm is to estimate the quality of service ("QoS"), in e.g. terms of bit rate and required bit error rate, for all the BS candidates. Those BSs are then preselected which provide sufficient QoS for the requested service.
  • QoS quality of service
  • a high QoS is equivalent to a low BER with a sufficient data rate, as shown in Figures 5a, 5b.
  • Other embodiments in the case of transparent services using an adaptive source rate would evaluate a high QoS as equivalent to a sufficient BER with a high data rate.
  • a high QoS would be evaluated as equivalent to high speech quality. This would be used in the situation where several speech Codecs were in use, which is the case with adaptive multirate ("AMR”) in GSM. 16
  • the final step 540 of the algorithm is to select the one BS among the list of candidate BSs with maximum link quality, e.g. measured by the received BCH signal strength out of those BSs which provide sufficient QoS as shown in Fig. 5a. Handover will then be performed to , that cell providing the sufficient QoS.
  • Figure 5b illustrates an optional extension to this final step.
  • the first three steps 510, 520 and 530 in Figure 4a have corresponding equivalent steps 515, 525, and 535, in the embodiment shown in Figure 5b.
  • the final selection procedure 545 of selecting the BS with sufficient QoS may additionally take into account system criteria like load and interference level, as further described above in connection with Figure 3b.
  • the final step 545 of the algorithm in Figure 5b consists of simultaneously checking which BS fulfils two prerequisites: maximum link quality and applied system criteria.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

D'une manière générale, la présente invention concerne le problème de la sélection de cellules, par exemple pour le transfert intercellulaire, dans des systèmes de télécommunication mobiles, et plus particulièrement le problème de la sélection de la cellule optimale parmi des cellules ayant différentes capacités dues à différents modes d'interfaces hertziennes. Des algorithmes connus permettant la sélection de cellules et le transfert sont étendus par application de critères additionnels prenant en compte les capacités, dus aux différents schémas de modulation et de codage, de la station mobile et des stations de base constituant des candidats possibles. La qualité de service ('QoS') est prédite pour les différents candidats cellulaires sur la base d'une combinaison d'intensité de signal ou C/I, des capacités des différentes cellules, de la capacité à intervalles de temps multiples, etc. Ensuite, la cellule présentant la QoS prédite maximale est sélectionnée. Dans un autre mode de réalisation, l'invention est étendue par prise en compte d'autres critères appropriés, du point de vue du système, par exemple pour éviter une augmentation significative de la probabilité d'interruption moyenne ou du niveau de parasites. La présente invention accroît l'utilisation de stations de base prenant en charge des débits de données élevés. Le résultat se traduit par une augmentation de la capacité globale du système.
PCT/SE1999/000440 1998-04-01 1999-03-19 Selection de cellules dans des systemes radio mobiles WO1999051052A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002326637A CA2326637A1 (fr) 1998-04-01 1999-03-19 Selection de cellules dans des systemes radio mobiles
BR9909304-9A BR9909304A (pt) 1998-04-01 1999-03-19 Processo e sistema para seleção de célula em um sistema de comunicações móveis celulares
DE19983085T DE19983085B3 (de) 1998-04-01 1999-03-19 Zellenauswahl in Mobilfunksystemen
AU36330/99A AU3633099A (en) 1998-04-01 1999-03-19 Cell selection in mobile radio systems
GB0024558A GB2352139B (en) 1998-04-01 1999-03-19 Cell selection in mobile radio systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9801172A SE9801172D0 (sv) 1998-04-01 1998-04-01 Cell selection in a system with different cell capabilities
SE9801172-9 1998-04-01

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WO1999051052A1 true WO1999051052A1 (fr) 1999-10-07

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US (1) US6542742B2 (fr)
CN (1) CN1304624A (fr)
AU (1) AU3633099A (fr)
BR (1) BR9909304A (fr)
CA (1) CA2326637A1 (fr)
DE (1) DE19983085B3 (fr)
ES (1) ES2181569B1 (fr)
GB (1) GB2352139B (fr)
SE (1) SE9801172D0 (fr)
WO (1) WO1999051052A1 (fr)

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US6542742B2 (en) 2003-04-01
BR9909304A (pt) 2000-11-21
GB2352139B (en) 2003-05-21
DE19983085T1 (de) 2001-06-21
GB2352139A (en) 2001-01-17
US20010046879A1 (en) 2001-11-29
ES2181569A1 (es) 2003-02-16
AU3633099A (en) 1999-10-18
DE19983085B3 (de) 2013-03-28
GB0024558D0 (en) 2000-11-22
ES2181569B1 (es) 2004-06-01
SE9801172D0 (sv) 1998-04-01
CA2326637A1 (fr) 1999-10-07
CN1304624A (zh) 2001-07-18

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